Who is to blame for excess body weight?

It is a deeply loaded question, and one to which many people silently hold a firm answer: Excess weight is fundamentally an individual failure of self-control. On social media, in policy debates, and across everyday conversations, one cultural narrative has seemingly persisted—that some people simply have the discipline to resist temptation, while others just do not.

In behavioural science, self-control is formally defined as an individual’s ability to modify or override their internal thoughts, emotions, and impulsive actions in order to align with their long-term goals. Academics conceptualise this in distinct ways. Some view it through the lens of “ego depletion“—self-control as a finite personal reserve, like a muscle, that fatigues with overuse—while others see it as a self-correcting feedback loop, or as a dynamic interaction between our reflective mind and our impulsive, automatic drives.

A competing narrative argues that, in a world where almost half of the global population is living with overweight or obesity, body weight is not a personal failure at all, but rather a context failure. In this view, we are all swamped by a toxic, hyper-palatable food environment that has been explicitly engineered to overwhelm our conscious restraint.

The Limits of Self-Control

Distinguishing between these narratives is important as it dictates where we focus our energy when it comes to prevention.

If weight is primarily a contextual problem, the solution then lies in reorganizing the food system. Environmental nudges, like reducing portion sizes or reformulating products offer broad-spectrum fixes that can support the majority of the population. The trade-off? Critics argue this approach is paternalistic and penalizes consumer freedom.

Conversely, if weight is viewed as a self-control failure, the solution is advice and skill-building targeted at the individual. This line of thinking has sparked an abundance of digital health apps and counselling services designed to boost personal self-control resources – all widely available while population-level obesity continues to rise unabated.

Indeed, one of the more fundamental issues when it comes to existing self-control-based approaches is not in successfully initiating weight loss, but in maintaining it over time. Decades of research show that while dietary behaviour change interventions can lead to significant short-term weight loss, between one-to-two thirds of weight is usually regained in a year, and nearly all is back on within five.

The GLP-1 Disruption: Biology vs. Environment

Enter GLP-1 receptor agonists (GLP-1s). These medications are attracting global attention for helping users to achieve weight losses of up to 20 percent when adherence is optimal—a shift that is challenging some of our core assumptions about dietary self-control.

Firstly, GLP-1s are demonstrating that weight management is not merely a self-regulation failure. By modulating central reward pathways and gut-brain signalling, these drugs clearly reveal that “willpower” can be pharmacologically altered.

Secondly, GLP-1s are also highlighting that we are not helpless victims of our environment either. By quieting intrusive “food noise,” these medications allow users to break out of the automatic trigger-response-reward habit loop when it comes to their diet, proving that environmental cues can in fact be successfully managed.

New Solution, Same Problem

Despite impressive early results, emerging longer-term data is starting to reveal a familiar pattern when it comes to maintenance, however: significant weight re-gain when medications are eventually stopped.

Notably, in the GLP-1 era, this rebound carries unique risks because pharmacologically induced weight loss can be exceptionally deep and rapid. As a result, it is often accompanied by muscle loss, which subsequently alters metabolic rate and exacerbates outcomes such as sarcopenic obesity.

From a more psychological lens, another critical issue for GLP-1 users lies in causal attribution. When weight loss is primarily driven by a weekly injection, individuals are naturally inclined to attribute successes to an external agent, rather than developing an internal locus of control and building their dietary self-efficacy.

This is a risky attribution over the long term. Relying on lifelong pharmacological appetite suppression, with all its associated financial costs, gastrointestinal side effects, and potential nutritional deficiencies, is neither a realistic nor complete solution for everyone.

Skill-Building in the Quiet Space

Yet GLP-1s do not have to automatically render dietary self-control obsolete.

Instead, they may in fact be opening up a powerful new window of opportunity to train self-regulation skills through dedicated lifestyle behaviour change programs tailored to the unique obstacles faced by users throughout their weight loss journey.

For example, we might start by capitalizing on the new period of quiet at the beginning of treatment. The moment so-called food noise starts to wane presents a golden opening when individuals may finally have the cognitive bandwidth to absorb self-regulation skills, learn how to manage environmental triggers, and build positive habit loops without fighting a constant impulse control war.

As treatment progresses, programs must sustain engagement through side effects. This means offering practical strategies to manage outcomes like nausea before they cause premature drop-off. It also means helping patients navigate a blunted dopaminergic reward system. As medication reduces pleasure derived from food or alcohol, effective behaviour change support should guide individuals toward cultivating alternative, non-nutritional sources of reward to ensure change are not just made, but maintained.

Finally, and perhaps most importantly, we must plan for the transition off the medication and relapse prevention. Here, interventions should actively help users internalize their achievements, re-attributing progress to their daily choices rather ascribing it solely to the drug.

The New Era of Behavioural Weight Management

A recent study exploring perceptions of those losing weight with GLP-1s versus behaviour change or bariatric surgery presents an eye-opening finding: individuals who lost weight using medication were rated as less competent, less popular, and even less moral by onlookers, while also being assumed to have poorer lifestyle habits even without any information to base this viewpoint on.

These results show that even as the conversation evolves in this new era of weight management, social assumptions around the moral value of willpower remain close to the surface. Yet GLP-1s continue to demonstrate that self-control can clearly benefit from a biological boost. By dampening hunger and quieting food noise, these medications are helping more and more people break deeply entrenched behavioural patterns, offering a vital window of opportunity for healthier habits to take root, provided they are paired with dedicated support services designed for that exact purpose.